Examine source code of Super Mario Theme RBY

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Mario Theme",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(255, 3, 7)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(80, 99, 255)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(255, 243, 0)",
      "toolbar_field_text": "rgb(0, 0, 34)",
      "tab_line": "rgb(255, 0, 53)",
      "popup": "rgb(255, 0, 4)",
      "popup_text": "rgb(255, 255, 255)",
      "tab_loading": "rgb(255, 0, 53)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{099ae076-b3b6-4770-838f-f3341be07b99}"
    }
  }
}